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Many studies at universities, conducted around the world have shown clearly that recuperation from strength training requires far more rest time than previously thought.

The latest studies have indicated that high intensity strength trained muscles need more time than previously thought to recover and become stronger some studies show that muscles are still overcompensating and getting stronger for up to 21 days after the previous workout.

Researchers have found that fitness enthusiasts can reduce the time they spend working out by two-thirds and still achieve the same results. A study involving male weightlifters has suggested it is counter-productive to spend hours exercising.

Those who exercised less saw significant decrease in body fat. The study focused on 16 students aged 19 to 23, who already worked out regularly. They were split into two groups. Both carried out upper-body training three times a week for eight weeks. One group did one set of eight repetition: the other did three sets of the same exercise.

At the end of the study both groups had improved "significantly" in terms of muscular strength, said researchers from the health and exercise science unit at the University of Glamorgan in Pontypridd, Wales. Report author Dr Julien Baker said "This study indicates that it is counter-productive to spend hours at the gym, and that a shorter work-out can achieve exactly the same results.

Muscles take between 4-7 days to fully recover from a workout and another 2-3 days for over-compensation to take place. It can also take up to 7-14 days for the neuro - muscular system to fully recover from a high intensity strength training session.